1 # strerror.m4 serial 9 2 dnl Copyright (C) 2002, 2007-2008 Free Software Foundation, Inc. 3 dnl This file is free software; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl with or without modifications, as long as this notice is preserved. 6 7 AC_DEFUN([gl_FUNC_STRERROR], 8 [ 9 AC_REQUIRE([gl_FUNC_STRERROR_SEPARATE]) 10 if test $REPLACE_STRERROR = 1; then 11 AC_LIBOBJ([strerror]) 12 AC_DEFINE_UNQUOTED([REPLACE_STRERROR], [$REPLACE_STRERROR], 13 [Define this to 1 if strerror is broken.]) 14 fi 15 ]) 16 17 # Like gl_FUNC_STRERROR, except prepare for separate compilation (no AC_LIBOBJ). 18 AC_DEFUN([gl_FUNC_STRERROR_SEPARATE], 19 [ 20 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) 21 AC_REQUIRE([gl_HEADER_ERRNO_H]) 22 if test -z "$ERRNO_H"; then 23 AC_CACHE_CHECK([for working strerror function], 24 [gl_cv_func_working_strerror], 25 [AC_RUN_IFELSE( 26 [AC_LANG_PROGRAM( 27 [[#include <string.h> 28 ]], 29 [[return !*strerror (-2);]])], 30 [gl_cv_func_working_strerror=yes], 31 [gl_cv_func_working_strerror=no], 32 [dnl Assume crossbuild works if it compiles. 33 AC_COMPILE_IFELSE( 34 [AC_LANG_PROGRAM( 35 [[#include <string.h> 36 ]], 37 [[return !*strerror (-2);]])], 38 [gl_cv_func_working_strerror=yes], 39 [gl_cv_func_working_strerror=no]) 40 ]) 41 ]) 42 if test $gl_cv_func_working_strerror = no; then 43 dnl The system's strerror() fails to return a string for out-of-range 44 dnl integers. Replace it. 45 REPLACE_STRERROR=1 46 fi 47 else 48 dnl The system's strerror() cannot know about the new errno values we add 49 dnl to <errno.h>. Replace it. 50 REPLACE_STRERROR=1 51 fi 52 if test $REPLACE_STRERROR = 1; then 53 gl_PREREQ_STRERROR 54 fi 55 ]) 56 57 # Prerequisites of lib/strerror.c. 58 AC_DEFUN([gl_PREREQ_STRERROR], [ 59 AC_CHECK_DECLS([strerror]) 60 AC_CHECK_HEADERS_ONCE([sys/socket.h]) 61 if test $ac_cv_header_sys_socket_h != yes; then 62 dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make 63 dnl the check for those headers unconditional; yet cygwin reports 64 dnl that the headers are present but cannot be compiled (since on 65 dnl cygwin, all socket information should come from sys/socket.h). 66 AC_CHECK_HEADERS([winsock2.h]) 67 fi 68 ]) 69
